[Bug 1589289] [NEW] fstrim: cannot open /dev/.lxd-mounts: Permission denied

[Tamas Papp]

Public bug reported:

fstrun daily cronjob output in an unprivileged LXD container:

/etc/cron.weekly/fstrim:
fstrim: cannot open /dev/.lxd-mounts: Permission denied
fstrim: /dev/fuse: not a directory
fstrim: /dev/lxd: FITRIM ioctl failed: Operation not permitted


There is a github issue:

https://github.com/lxc/lxd/issues/2030


The outcome is that it's purely an fstrim misbehaviour, it could be smarter.


Stephane Graber comment:


As all of this is handled by the kernel, there isn't anything we can do
about it in LXD.

I think fstrim should be made slightly more clever:

* Don't run on bind-mounts (you can detect bind-mounts by parsing /proc/self/mountinfo instead of /proc/mounts)
* Maybe not be as noisy on expected errors like EACCES, EPERM and ENOENT, only log actual failures which would likely be EINVAL or memory related errors.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: util-linux 2.27.1-6ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sun Jun  5 19:49:04 2016
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1589289

Title:
  fstrim: cannot open /dev/.lxd-mounts: Permission denied

Status in util-linux package in Ubuntu:
  New

Bug description:
  fstrun daily cronjob output in an unprivileged LXD container:

  /etc/cron.weekly/fstrim:
  fstrim: cannot open /dev/.lxd-mounts: Permission denied
  fstrim: /dev/fuse: not a directory
  fstrim: /dev/lxd: FITRIM ioctl failed: Operation not permitted

  
  There is a github issue:

  https://github.com/lxc/lxd/issues/2030

  
  The outcome is that it's purely an fstrim misbehaviour, it could be smarter.

  
  Stephane Graber comment:


  
  As all of this is handled by the kernel, there isn't anything we can do about it in LXD.

  I think fstrim should be made slightly more clever:

  * Don't run on bind-mounts (you can detect bind-mounts by parsing /proc/self/mountinfo instead of /proc/mounts)
  * Maybe not be as noisy on expected errors like EACCES, EPERM and ENOENT, only log actual failures which would likely be EINVAL or memory related errors.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: util-linux 2.27.1-6ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Sun Jun  5 19:49:04 2016
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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